The Synology D4RD-2666 series provides professional-grade DDR4 RDIMM ECC memory modules in 16GB and 32GB capacities. Designed for enterprise systems like the SA6400 and HD6500, these registered modules operate at 1.2V and feature real-time error correction to prevent data corruption. Rigorously tested for seamless DSM integration, they enhance system stability for virtualization, 24/7 operations, and high-availability clusters. These modules allow for massive scalability, supporting up to 1TB of RAM in flagship models, ensuring optimal responsiveness and multitasking for mission-critical business applications.